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Tangency Theorem

The external (internal) Similarity Point of two fixed Circles is the point at which all the Circles homogeneously (nonhomogeneously) tangent to the fixed Circles have the same Power and at which all the tangency secants intersect.


Dörrie, H. 100 Great Problems of Elementary Mathematics: Their History and Solutions. New York: Dover, p. 157, 1965.

© 1996-9 Eric W. Weisstein